A fan-made online fighting games based on the Capcom Vs. series. Formerly known as X-Men Vs. Street Fighter (Not to be confused with the arcade fighter of the same name.)

This game has shown rivalry with the Mugen Fighting Engine community and has also been the source of much controversy, including the unauthorized use of Mugen spriter and coder Reuben Kee's Evil Ryu sprites which he personally edited.

The game is known for it's excessive use of flashy effects and "broken" game play in the fighting game community.

(Note: This game is not to be confused with Street Fighter Online: The Mouse Generation)

"There are so many fan fighting games out there! Street Fighter Online is one of them!"